#include <stdio.h>

int a = 20;
int sum(int a, int b);

int main() {
	// int a = 0;
	int b = 0;

	printf("sum = %d\n", sum(a, b));

	return 0;
}

int test() {
	return sum(1, 2);
}

int sum(int a, int b) {
	return a + b;	
}
